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Retroreflector and Multibeam Antenna...

Ecole Polytechnique, Montreal (Canada).

Retroreflector and Multibeam Antenna for a Millimeter Wave Collision Avoidance System.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Retroreflector and Multibeam Antenna for a Millimeter Wave Collision Avoidance System.
作者:	Numan, Ahmed Bilal.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, 2018
面頁冊數:	130 p.
附註:	Source: Dissertation Abstracts International, Volume: 76-11C.
附註:	Advisers: Jean-Jacques Laurin; Jean-Francois Frigon.
Contained By:	Dissertation Abstracts International76-11C.
標題:	Electrical engineering.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10957124

Retroreflector and Multibeam Antenna for a Millimeter Wave Collision Avoidance System.
Numan, Ahmed Bilal.

Retroreflector and Multibeam Antenna for a Millimeter Wave Collision Avoidance System. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 130 p.

Source: Dissertation Abstracts International, Volume: 76-11C.

Thesis (Ph.D.)--Ecole Polytechnique, Montreal (Canada), 2018.

Rear radar cross section (RCS) of automotive targets has a narrow angular response. A variation of several decibel per square meter (dBsm) can also be observed with slight change in the target orientation. Localization of such targets is challenging for an automotive radar. Furthermore, complex hardware is typically required to implement an effective radar resulting in high-cost systems that are affordable only in high-end vehicles. This defies the object of a safety system to avoid roadside accidents at large scale. This dissertation presents novel RCS enhancing tag and multibeam antenna for automotive radar applications. These components can possibly improve the performance of a super-resolution algorithm, and enable the development of a simple, low-cost automotive collision avoidance radar. Simple and costeffective system architecture is particularly important in millimeter wave frequency range, allocated for this application, where the material losses and device costs are significantly high. The proposed structures in this thesis can also find applications in other millimeter wave applications.Subjects--Topical Terms:

454503
Electrical engineering.

Retroreflector and Multibeam Antenna for a Millimeter Wave Collision Avoidance System.
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500 $a Source: Dissertation Abstracts International, Volume: 76-11C.
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502 $a Thesis (Ph.D.)--Ecole Polytechnique, Montreal (Canada), 2018.
520 $a Rear radar cross section (RCS) of automotive targets has a narrow angular response. A variation of several decibel per square meter (dBsm) can also be observed with slight change in the target orientation. Localization of such targets is challenging for an automotive radar. Furthermore, complex hardware is typically required to implement an effective radar resulting in high-cost systems that are affordable only in high-end vehicles. This defies the object of a safety system to avoid roadside accidents at large scale. This dissertation presents novel RCS enhancing tag and multibeam antenna for automotive radar applications. These components can possibly improve the performance of a super-resolution algorithm, and enable the development of a simple, low-cost automotive collision avoidance radar. Simple and costeffective system architecture is particularly important in millimeter wave frequency range, allocated for this application, where the material losses and device costs are significantly high. The proposed structures in this thesis can also find applications in other millimeter wave applications.
520 $a A radar system is analyzed by studying the properties of Estimation of Signal Parameters via Rotational Invariance Technique (ESPRIT), a well know super-resolution algorithm. Based on a MATLAB numerical simulation of this algorithm, it is established that a stable target RCS is important for employing this algorithm in automotive applications. This can be achieved by equipping the target with a RCS enhancing tag. Secondly, in this algorithm, the size of the receiver array determines the number of detectable targets. By sectoring the radar field of view (FoV) using a multibeam antenna, the localization error can be reduced for higher number of targets.
520 $a The proposed tag is designed at 77 GHz, operating in the band allocated for automotive radar (76 GHz to 81 GHz). Automotive radar characteristics in the literature suggest a fan-beam shaped FoV for the tag with wider FoV in azimuth plane. Azimuth and elevation plane FoV of 120o and 9o are selected as design criteria for the proposed tag. Retroreflection property in the azimuth plane helps to improve the tag RCS. The proposed tag reflects the incident signal with 90o linear polarization rotation. This polarization modulation can enhance the target visibility against the background clutter. Additionally, an amplitude modulation is also implemented in the tag. This modulation can help to communicate additional information. It can also facilitate the target detection by improving the signal to noise ratio of the processed received signal.
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